Seeking Help On Identifying This French? Stamp

This stamp has me stumped. I am not even sure that it is an overprint although it is mint so I am assuming that it is…
Any input/suggestions as to its identify would be greatly appreciated.
Thank you in advance
Don

It looks like part of a slogan from a machine cancel to me. Does it still have completely undisturbed gum on the back?

BattleStamps, thank you for the question. Yes, it appears to be undisturbed gum. I've update the image above to show back of stamp (you may have to 'refresh' your web page).
don

It really does look like a slogan box cancel. There's more faint text in the middle of the stamp - at least two more lines. There's not enough of it for me to match it with anything unfortunately. If the stamp was once part of a strip or block that was affixed to cover the gum could still be intact if it wasn't fully affixed to the cover to begin with - partially or barely licked. I wouldn't call this stamp mint.

I believe I can see French part words. Top line MIGHT be "TELEGRAPHIE" and the bottom line is "FRANCAISE". The POSTES would seem to rule out a telegraph stamp but an overprint or slogan might be possible. Weird one, anyway!